Which compound of an element in period 3 reacts with water to form a solution with a pH greater than 7?A. SiO2
B. SiCl4
C. NaCl
D. Na2O
Answers
The compound of an element in period 3 that reacts with water to form a solution with a pH greater than 7 is:
D. Na₂O (sodium oxide)
In period 3 of the periodic table, the elements are sodium (Na) and silicon (Si), among others. Let's analyze the options:
A. SiO₂ (silicon dioxide) does not react with water to form a solution with a pH greater than 7. It is an acidic oxide and can react with water to form a weakly acidic solution.
B. SiCl₄ (silicon tetrachloride) is not a compound that reacts with water to form a solution with a pH greater than 7. It hydrolyzes with water to produce hydrochloric acid, which leads to a decrease in pH (more acidic).
C. NaCl (sodium chloride) does not react with water to form a solution with a pH greater than 7. It is a neutral compound and does not affect the pH of water.
D. Na₂O (sodium oxide) reacts vigorously with water to form sodium hydroxide (NaOH), a strong base. Sodium hydroxide is highly soluble in water and completely dissociates into hydroxide ions (OH⁻) and sodium ions (Na⁺). The presence of hydroxide ions in the solution makes it basic, resulting in a pH greater than 7.
Therefore, the correct answer is D. Na₂O (sodium oxide).
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Nasub(2)O + H2O --> 2 NaOH
Nasub(2)O solution has pH much higher than 7
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Soil
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a. True
b. False
Answers
Answer:
a. True
Explanation:
The atomic radius is taken as the half of the inter nuclear distance between two atoms that are covalently bonded.
Across a period, the atomic radii usually decrease progressively because the nuclear charge(number of protons in the nucleus) increases without the increase in the number of electronic shell. Therefore, the electrons are pulled more to the nucleus.
Down a group, the effect of the nuclear pull is reduced because the number of electron shell increases and the nuclear charge is being compensated for.
Answers
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Explanation:
b. 1067
c. 1.13
d. 63
Answers
Answer: the correct answer is option(d).
Explanation:
Energy required ,Q= ?
Mass of water , m = 17 grams
Temperature difference or = 15 °C
Specific heat value of water = 4.186 J/g °C
From the given value the , nearest value to to our calculated answer is 1067 J that option (b).
Hence, the correct answer is option (d).
B) Mixtures cannot be separated by physical means.
C) Mixtures consist of only one kind of atom.
D) Mixtures have to or more substances mixed together, but are not chemically combined.